ドーピング強化の短距離のペロブスキートナノ結晶の近単位の紫色発光量出力
Zi-Jun Yong1, Shao-Qiang Guo2, Ju-Ping Ma1
1College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Jiangsu , 215123 , China.
Journal of the American Chemical Society
|July 17, 2018
まとめ
ニッケルイオンドーピングは,格子秩序を改善し,欠陥を減らすことによって,全無機紫色放射性ペロブスキートナノ結晶 (NCs) を強化します. このブレークスルーにより,高度な光電子アプリケーションで,光発光量子出力率 (PLQYs) が達成される.
科学分野:
- 材料科学
- ナノテクノロジー
- 固体物理学
背景:
- 全無機ペロブスキートナノ結晶 (NC) は,低コストの半導体発光材料を提供しています.
- 高い光発光量 (PLQY) は緑色と赤色のスペクトル範囲で達成されるが,紫色の放射は弱いままである.
- 紫色放射性ペロブスキートNCの限界を理解することは,光電子アプリケーションにとって極めて重要です.
研究 の 目的:
- PLQYが高い全無機紫色放射性ペロブスキートNCを合成するための戦略を開発する.
- 紫色を放出するペロブスキートNCの性能における格子秩序と欠陥の役割を調査する.
- 紫色を放射するペロブスキットベースの光電子装置を 実現するためです
主な方法:
- ニッケル (Ni) イオンドーピングによる全無機ペロブスキートNCの合成.
- 定常状態と時間解像度のルミネッセンススペクトロスコーピーを用いた特徴付け.
- 核磁共振スペクトルのX線吸収スペクトルと魔法の角度回転の分析
- デフェクト形成と電子特性を理解するための密度関数理論 (DFT) の計算.
主要な成果:
- ペロブスキートNCにおける格子局域のドーピング工学.
- ハリドの空白などの固有の欠陥の除去により,短距離の格子秩序が増加します.
- 紫色を放出するペロブスキートNCsのほぼ単位のPLQYの実証.
- DFTの計算により,Niドーピングは欠陥形成エネルギーを増加させ,深層のトラップ状態を回避します.
結論:
- 内在的な欠陥による近距離の格子障害は,紫色放射性ペロブスキートNCにおけるPLQYを制限する.
- Niドーピングは局所的な格子秩序を効果的に強化し,PLQYをユニットに近いレベルに高めます.
- この進歩は,高性能のバイオレット放射ペロブスキート光電子装置の開発を容易にする.
関連する概念動画
Quantum Numbers
51.7K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
51.7K
The Quantum-Mechanical Model of an Atom
59.0K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
59.0K
ATP Yield
79.0K
Cellular respiration produces 30 - 32 ATP per glucose molecule. Although most of the ATP results from oxidative phosphorylation and the electron transport chain (ETC), 4 ATP are gained beforehand (2 from glycolysis and 2 from the citric acid cycle).
The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
79.0K
Reaction Yield
60.0K
The theoretical yield of a reaction is the amount of product estimated to form based on the stoichiometry of the balanced chemical equation. The theoretical yield assumes the complete conversion of the limiting reactant into the desired product. The amount of product that is obtained by performing the reaction is called the actual yield, and it may be less than or (very rarely) equal to the theoretical yield.
60.0K
Range
14.3K
The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
Measurements of the amount of soda in a 16-ounce can vary since different subjects record these measurements or since the exact amount - 16 ounces of liquid, was not...
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
Measurements of the amount of soda in a 16-ounce can vary since different subjects record these measurements or since the exact amount - 16 ounces of liquid, was not...
14.3K
¹H NMR: Long-Range Coupling
2.7K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.7K


